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Cloudera Certified Administrator for Apache Hadoop CDH4 Sample Questions:

1. How many mappers required for a map reduce, job determine on a cluster running map reduce V1 (MRv1)?

A) The number mappers is equal to no of input splits calculated by client submitting
B) The number of mappers is calculated by namenode based on the number of HDFS blocks in the files
C) the developer specifies the number in the job configuration
D) the jobtracker chooses the number based on no of available nodes

2. In HDFS, you view a file with rw-r--r-- set as its permissions. What does this tell you about the file?

A) As a Filesystem in Userspace (FUSE), HDFS files are available to all user's on a cluster regardless of their underlying POSIX permissions.
B) The file cannot be run as a MapReduce job
C) The file cannot be deleted by anyone but the owner
D) The file's contents can be modified by the owner, but no-one else
E) The file cannot be deleted by anyone

3. Choose three reasons why should you run the HDFS balancer periodically?

A) To ensure that there is consistent disk utilization across the DataNodes.
B) To improve data locality for MapReduce tasks.
C) To help HDFS deliver consistent performance under heavy loads.
D) To ensure that all blocks in the cluster are 128MB in size.
E) To ensure that there is capacity in HDFS tor additional data.

4. Which two features does Kerberos security add to a Hadoop cluster?

A) Encryption for data on disk ("at rest")
B) Authentication for user access to the cluster against a central server
C) Encryption on all remote procedure calls (RPCs)
D) Root access to the cluster for users hdfs and mapred but non-root acess clients
E) User authentication on all remote procedure calls (RPcs)

5. When planning a hadoop cluster, what general rule governs the hardware requirements between master nodes and slave nodes?

A) the master nodes requires less memory and fewer number disk drives than the slave nodes
B) The master and slave nodes should have the same hardware configuration
C) The master nodes requires more memory but less disk capacity
D) The master nodes require more memory and greater disk capacity then the slave nodes
E) The master nodes requires more memory and no disk drives

Solutions: